Industrial Mechanic (Millwright) exam: Bearings

Key points

• Ball bearings handle lighter loads and higher speeds. Roller bearings handle heavier loads.
• Tapered rollers take radial and thrust loads together.
• The rotating ring usually gets the interference fit.
• Heat a bearing with an induction heater, never an open flame, and keep it under the maker's limit.
• Too much grease causes heat as quickly as too little.

Study tip

Learn the failure patterns: brinelling from impact, spalling from fatigue, discolouration from heat.

Try these

1. Which bearing best handles combined radial and thrust loads?

   1. Deep groove ball
   2. Cylindrical roller
   3. Tapered roller
   4. Needle
   Show answer

   C. Tapered roller Tapered rollers carry both.

2. The ring that rotates relative to the load usually gets:

   1. A loose fit
   2. An interference fit
   3. No fit
   4. A slip fit always
   Show answer

   B. An interference fit Prevents creep.

3. Evenly spaced dents in a race from impact are called:

   1. Spalling
   2. Brinelling
   3. Fretting
   4. Pitting
   Show answer

   B. Brinelling True brinelling comes from shock loads.

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